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<meta name="description" content="Use the TableLayout extension to arrange nodes in a tabular or grid-like form."/> 
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<title>Table Layout</title>
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          <h1 class="mb-0 p-1 ">GoJS</h1>
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    <!-- Start of GoJS sample code -->
    
    <script src="../release/go.js"></script>
    <div class="p-4 w-full">
<script src="TableLayout.js"></script>

<script id="code">
  // define a custom ResizingTool to limit how far one can shrink a row or column
  function LaneResizingTool() {
    go.ResizingTool.call(this);
  }
  go.Diagram.inherit(LaneResizingTool, go.ResizingTool);

  LaneResizingTool.prototype.computeMinSize = function() {
    var diagram = this.diagram;
    var lane = this.adornedObject.part;  // might be row or column
    var horiz = (lane.category === "Column Header");  // or "Row Header"
    var margin = diagram.nodeTemplate.margin;
    var bounds = new go.Rect();
    diagram.findTopLevelGroups().each(function(g) {
      if (horiz ? (g.column === lane.column) : (g.row === lane.row)) {
        var b = diagram.computePartsBounds(g.memberParts);
        if (b.isEmpty()) return;  // nothing in there?  ignore it
        b.unionPoint(g.location);  // keep any empty space on the left and top
        b.addMargin(margin);  // assume the same node margin applies to all nodes
        if (bounds.isEmpty()) {
          bounds = b;
        } else {
          bounds.unionRect(b);
        }
      }
    });

    // limit the result by the standard value of computeMinSize
    var msz = go.ResizingTool.prototype.computeMinSize.call(this);
    if (bounds.isEmpty()) return msz;
    return new go.Size(Math.max(msz.width, bounds.width), Math.max(msz.height, bounds.height));
  };

  LaneResizingTool.prototype.resize = function(newr) {
    var lane = this.adornedObject.part;
    var horiz = (lane.category === "Column Header");
    var lay = this.diagram.layout;  // the TableLayout
    if (horiz) {
      var col = lane.column;
      var coldef = lay.getColumnDefinition(col);
      coldef.width = newr.width;
    } else {
      var row = lane.row;
      var rowdef = lay.getRowDefinition(row);
      rowdef.height = newr.height;
    }
    lay.invalidateLayout();
  };
  // end LaneResizingTool class

  function init() {
    if (window.goSamples) goSamples();  // init for these samples -- you don't need to call this
    var $ = go.GraphObject.make;

    myDiagram =
      $(go.Diagram, "myDiagramDiv",
        {
          layout: $(TableLayout,
            $(go.RowColumnDefinition, { row: 1, height: 22 }),  // fixed size column headers
            $(go.RowColumnDefinition, { column: 1, width: 22 }) // fixed size row headers
          ),
          "SelectionMoved": function(e) { e.diagram.layoutDiagram(true); },
          "resizingTool": new LaneResizingTool(),
          // feedback that dropping in the background is not allowed
          mouseDragOver: function(e) { e.diagram.currentCursor = "not-allowed"; },
          // when dropped in the background, not on a Node or a Group, cancel the drop
          mouseDrop: function(e) { e.diagram.currentTool.doCancel(); },
          "animationManager.isInitial": false,
          "undoManager.isEnabled": true
        });

    myDiagram.nodeTemplateMap.add("Header",  // an overall table header, at the top
      $(go.Part, "Auto",
        {
          row: 0, column: 1, columnSpan: 9999,
          stretch: go.GraphObject.Horizontal,
          selectable: false, pickable: false
        },
        $(go.Shape, { fill: "transparent", strokeWidth: 0 }),
        $(go.TextBlock, { alignment: go.Spot.Center, font: "bold 12pt sans-serif" },
          new go.Binding("text"))
      ));

    myDiagram.nodeTemplateMap.add("Sider",  // an overall table header, on the left side
      $(go.Part, "Auto",
        {
          row: 1, rowSpan: 9999, column: 0,
          stretch: go.GraphObject.Vertical,
          selectable: false, pickable: false
        },
        $(go.Shape, { fill: "transparent", strokeWidth: 0 }),
        $(go.TextBlock, { alignment: go.Spot.Center, font: "bold 12pt sans-serif", angle: 270 },
          new go.Binding("text"))
      ));

    myDiagram.nodeTemplateMap.add("Column Header",  // for each column header
      $(go.Part, "Spot",
        {
          row: 1, rowSpan: 9999, column: 2,
          minSize: new go.Size(100, NaN),
          stretch: go.GraphObject.Fill,
          movable: false,
          resizable: true,
          resizeAdornmentTemplate:
            $(go.Adornment, "Spot",
              $(go.Placeholder),
              $(go.Shape,  // for changing the length of a lane
                {
                  alignment: go.Spot.Right,
                  desiredSize: new go.Size(7, 50),
                  fill: "lightblue", stroke: "dodgerblue",
                  cursor: "col-resize"
                })
            )
        },
        new go.Binding("column", "col"),
        $(go.Shape, { fill: null },
          new go.Binding("fill", "color")),
        $(go.Panel, "Auto",
          { // this is positioned above the Shape, in row 1
            alignment: go.Spot.Top, alignmentFocus: go.Spot.Bottom,
            stretch: go.GraphObject.Horizontal,
            height: myDiagram.layout.getRowDefinition(1).height
          },
          $(go.Shape, { fill: "transparent", strokeWidth: 0 }),
          $(go.TextBlock,
            {
              font: "bold 10pt sans-serif", isMultiline: false,
              wrap: go.TextBlock.None, overflow: go.TextBlock.OverflowEllipsis
            },
            new go.Binding("text"))
        )
      ));

    myDiagram.nodeTemplateMap.add("Row Sider",  // for each row header
      $(go.Part, "Spot",
        {
          row: 2, column: 1, columnSpan: 9999,
          minSize: new go.Size(NaN, 100),
          stretch: go.GraphObject.Fill,
          movable: false,
          resizable: true,
          resizeAdornmentTemplate:
            $(go.Adornment, "Spot",
              $(go.Placeholder),
              $(go.Shape,  // for changing the breadth of a lane
                {
                  alignment: go.Spot.Bottom,
                  desiredSize: new go.Size(50, 7),
                  fill: "lightblue", stroke: "dodgerblue",
                  cursor: "row-resize"
                })
            )
        },
        new go.Binding("row"),
        $(go.Shape, { fill: null },
          new go.Binding("fill", "color")),
        $(go.Panel, "Auto",
          { // this is positioned to the left of the Shape, in column 1
            alignment: go.Spot.Left, alignmentFocus: go.Spot.Right,
            stretch: go.GraphObject.Vertical, angle: 270,
            height: myDiagram.layout.getColumnDefinition(1).width
          },
          $(go.Shape, { fill: "transparent", strokeWidth: 0 }),
          $(go.TextBlock,
            {
              font: "bold 10pt sans-serif", isMultiline: false,
              wrap: go.TextBlock.None, overflow: go.TextBlock.OverflowEllipsis
            },
            new go.Binding("text"))
        )
      ));

    myDiagram.nodeTemplate =  // for regular nodes within cells (groups); you'll want to extend this
      $(go.Node, "Auto",
        { width: 100, height: 50, margin: 4 },  // assume uniform Margin, all around
        new go.Binding("row"),
        new go.Binding("column", "col"),
        $(go.Shape, { fill: "white" },
          new go.Binding("fill", "color")),
        $(go.TextBlock,
          new go.Binding("text", "key"))
      );

    myDiagram.groupTemplate =  // for cells
      $(go.Group, "Auto",
        {
          layerName: "Background",
          stretch: go.GraphObject.Fill,
          selectable: false,
          computesBoundsAfterDrag: true,
          computesBoundsIncludingLocation: true,
          handlesDragDropForMembers: true,  // don't need to define handlers on member Nodes and Links
          mouseDragEnter: function(e, group, prev) { group.isHighlighted = true; },
          mouseDragLeave: function(e, group, next) { group.isHighlighted = false; },
          mouseDrop: function(e, group) {
            // if any dropped part wasn't already a member of this group, we'll want to let the group's row
            // column allow themselves to be resized automatically, in case the row height or column width
            // had been set manually by the LaneResizingTool
            var anynew = e.diagram.selection.any(function(p) { return p.containingGroup !== group; });
            // Don't allow headers/siders to be dropped
            var anyHeadersSiders = e.diagram.selection.any(function(p) {
              return p.category === "Column Header" || p.category === "Row Sider";
            });
            if (!anyHeadersSiders && group.addMembers(e.diagram.selection, true)) {
              if (anynew) {
                e.diagram.layout.getRowDefinition(group.row).height = NaN;
                e.diagram.layout.getColumnDefinition(group.column).width = NaN;
              }
            } else {  // failure upon trying to add parts to this group
              e.diagram.currentTool.doCancel();
            }
          }
        },
        new go.Binding("row"),
        new go.Binding("column", "col"),
        // the group is normally unseen -- it is completely transparent except when given a color or when highlighted
        $(go.Shape,
          {
            fill: "transparent", stroke: "transparent",
            strokeWidth: myDiagram.nodeTemplate.margin.left,
            stretch: go.GraphObject.Fill
          },
          new go.Binding("fill", "color"),
          new go.Binding("stroke", "isHighlighted", function(h) { return h ? "red" : "transparent"; }).ofObject()),
        $(go.Placeholder,
          { // leave a margin around the member nodes of the group which is the same as the member node margin
            alignment: (function(m) { return new go.Spot(0, 0, m.top, m.left); })(myDiagram.nodeTemplate.margin),
            padding: (function(m) { return new go.Margin(0, m.right, m.bottom, 0); })(myDiagram.nodeTemplate.margin)
          })
      );

    myDiagram.model = new go.GraphLinksModel([
      // headers
      { key: "Header", text: "Vacation Procedures", category: "Header" },
      { key: "Sider", text: "Personnel", category: "Sider" },
      // column and row headers
      { key: "Request", text: "Request", col: 2, category: "Column Header" },
      { key: "Approval", text: "Approval", col: 3, category: "Column Header" },
      { key: "Employee", text: "Employee", row: 2, category: "Row Sider" },
      { key: "Manager", text: "Manager", row: 3, category: "Row Sider" },
      { key: "Administrator", text: "Administrator", row: 4, category: "Row Sider" },
      // cells, each a group assigned to a row and column
      { key: "EmpReq", row: 2, col: 2, isGroup: true, color: "lightyellow" },
      { key: "EmpApp", row: 2, col: 3, isGroup: true, color: "lightgreen" },
      { key: "ManReq", row: 3, col: 2, isGroup: true, color: "lightgreen" },
      { key: "ManApp", row: 3, col: 3, isGroup: true, color: "lightyellow" },
      { key: "AdmReq", row: 4, col: 2, isGroup: true, color: "lightyellow" },
      { key: "AdmApp", row: 4, col: 3, isGroup: true, color: "lightgreen" },
      // nodes, each assigned to a group/cell
      { key: "Delta", color: "orange", size: "100 100", group: "EmpReq" },
      { key: "Epsilon", color: "coral", size: "100 50", group: "EmpReq" },
      { key: "Zeta", color: "tomato", size: "50 70", group: "ManReq" },
      { key: "Eta", color: "coral", size: "50 50", group: "ManApp" },
      { key: "Theta", color: "tomato", size: "100 50", group: "AdmApp" }
    ]);

    myPalette =
      $(go.Palette, "myPaletteDiv",
        {
          nodeTemplateMap: myDiagram.nodeTemplateMap,
          "model.nodeDataArray": [
            { key: "Alpha", color: "orange" },
            { key: "Beta", color: "tomato" },
            { key: "Gamma", color: "goldenrod" }
          ]
        });
  }
  window.addEventListener('DOMContentLoaded', init);
</script>

<div id="sample">
  <div style="width: 100%; display: flex; justify-content: space-between">
    <div id="myPaletteDiv" style="width: 120px; height: 600px; margin-right: 2px; border: solid 1px black"></div>
    <div id="myDiagramDiv" style="flex-grow: 1; height: 600px; border: solid 1px black"></div>
  </div>
  <p>
  This sample demonstrates a custom Layout, TableLayout, that is very much like a simplified "Table" Panel layout,
  but working on non-Link Parts in a Diagram or a Group rather than on GraphObjects in a Panel.
  The layout is defined in its own file, as <a href="TableLayout.js">TableLayout.js</a>.
  </p>
  <p>
  You can drag-and-drop nodes from the Palette into any Group.
  Dragging into a Group highlights the Group.
  Drops must occur inside Groups; otherwise the action is cancelled.
  </p>
  <p>
  Each row and each column is <a>Part.resizable</a> and has a custom <a>Part.resizeAdornmentTemplate</a>
  showing a single resize handle on the right side or on the bottom.
  There is a custom LaneResizingTool to provide a minimum width or height based on the contents of all of the
  groups (cells) in that column or row.
  </p>
  <p>
  This example assumes the Groups are predefined and exist in each cell at a particular row/column,
  but this sample could be extended to allow adding and removing rows and/or columns.
  </p>
</div>
    </div>
    <!-- * * * * * * * * * * * * * -->
    <!--  End of GoJS sample code  -->
  </div>
</body>
<!--  This script is part of the gojs.net website, and is not needed to run the sample -->
<script src="../assets/js/goSamples.js"></script>
</html>
